Browsing articles tagged with "raid1 - Admins Goodies"
Aug 16, 2012
tom

Which RAID/LVM configuration for new 2x8TB file server is safest?

I just built a totally new PC to be a fileserver. It has one 60gb SSD for OS (ubuntu 12.04), and 8 2tb data drives in it. I am looking for the safest, most stable way to set up a single giant storage pool with redundancy. Considerations: My TOP priority is protection of the data. Availability, reliability, resiliency, recoverability, and risk management. All of those words which mean not losing my files. I’m not merely […]

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Aug 14, 2012
tom

Is there a way to prevent a SW RAID 1 from degrading?

I have a number of Debian servers in a datacenter and from time to time I notice that the software RAID 1 was degraded. While the re-sync process starts automatically and I don’t lose any data I find it annoying as it slows down the servers even for days while the HDDs are re-syncing. I was wondering what exactly causes the HDDs to de-sync in the first place and if there are any configuration options […]

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Aug 3, 2012
tom

RAID 10 vs RAID 1 SSDs

I’m considering moving a large database from mechanical disks to SSDs. My initial instinct was to go for RAID 10, but further research suggests that this configuration can significantly reduce the random access performance of the SSDs. The database is very much read heavy and it’s generally generating large data reports, so my assumption is that there is very little by way of sequential workload. The main alternative suggested to RAID 10 when it comes […]

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Apr 29, 2012
tom

sda1 (?) raid failed on debian – what to do now?

ispconfig says that my server has raid problems. The server is not mine, it is rented from a hosting company. The OS installation was not my business: the hosting firm did it. cat /proc/mdstat Personalities : [raid1] md0 : active raid1 sda1[2](F) sdb1[1] 312568576 blocks [2/1] [_U] I’m really not familiar with this problem, I never met problem like this. I guess sda1 is dead. Can you help me what to do now (apart from […]

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Apr 17, 2012
tom

Does the order of SAS drive matter when installing old drives?

I have an old ibm server with 12 hard drive bays, 4 of which are used (SAS 72gig drives), and configured in a raid 1 array. The server will be sent away for repairs, when it comes back, do I need to reassemble the drives in the same bays they were taken out? Thanks Dai Asked by Dai Bok Yes. Please try to keep the drives in the same positions. Label them before you send […]

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Apr 14, 2012
tom

What’s the difference between “mirror” and “raid1” in LVM?

On the lvconvert(8) man page it says: –type SegmentType Used to convert a logical volume to another segment type or to explicitly state the desired RAID1 segment type (“mirror” or “raid1″) when converting a linear logical volume to a mirror with the ‘-m’ argument. But what exactly is the difference between “mirror” and “raid1″? Asked by Julian I have not yet tried the new LVM segment types, but the overview is that they are support […]

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Apr 12, 2012
tom

RAID 1 Failover

Given two disks in a (hardware) RAID 1 configuration, what exactly happens to a production system when one drive fails? Is there any noticeable service interruption, or will the system continue performing as usual with only one disk until the faulty one can be replaced? (Ignoring any minor throughput changes caused by going from two disks to one) Asked by Paul This depends entirely on the type of RAID (software or hardware) and the storage […]

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Mar 31, 2012
tom

Backup data from RAID 1 disk out of its server

I’m facing with a pretty easy problem in my opinion. I’ve extracted a working disk from a RAID1 and I’m looking to copy only data (FS and RAID configuration doesn’t matter) into another location (another FS). My problem is I’m not able to mount properly this disk into another linux. I’ve first looked the partition table : # fdisk -l /dev/sdc Disk /dev/sdc: 640.1 GB, 640135028736 bytes 255 heads, 63 sectors/track, 77825 cylinders, total 1250263728 […]

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Feb 14, 2012
tom

Create a RAID1 Mirror After OS and apps have been installed

We are building a server but one of the new disks is dead on arrival. If we put the os and apps etc on the first disk, when we get the bad disk replaced can any one see any reason we shouldn’t be able to create a Raid 1 Mirror at that point? Asked by beakersoft It’s easy to make a RAID-1 volume after installation using Windows software RAID. Assuming you’re using Windows there’s no […]

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Jan 20, 2012
tom

RAID1 with non-empty HDDs on a NAS

On one hand I have 2 HDDs with data, which are clones of one another I made using Cavalry Retriever duplicator. On another hand I have a brand new Patriot Javelin S4 NAS unit. I’m new to both RAID and NAS, but I figured that for my purposes I need RAID1 (2 mirrored drives, or if I get another pair of drives — 2 pairs of 2 mirrored drives). Question Is there any way to […]

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